Th trip was on my crew member's bucket list. He had some prostate issues, but his urologist cleared him for trip and provided him with some catheters. The early motion sickness resulted in some dehydration which made things worse and he need to use the catheters. We hove-to to stabilize the boat. The situation got worse so, at his request, I contacted CG Honolulu via sat phone. After a consult with their Flight Surgeon a rendezvous was arranged with a 335 meter container ship bound for Los Angeles. We met 39 10N 150 W and made the transfer.